KVM: PPC: Book3S: Add support for ibm,int-on/off RTAS calls

This adds support for the ibm,int-on and ibm,int-off RTAS calls to the
in-kernel XICS emulation and corrects the handling of the saved
priority by the ibm,set-xive RTAS call.  With this, ibm,int-off sets
the specified interrupt's priority in its saved_priority field and
sets the priority to 0xff (the least favoured value).  ibm,int-on
restores the saved_priority to the priority field, and ibm,set-xive
sets both the priority and the saved_priority to the specified
priority value.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 40 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_rtas.c b/arch/powerpc/kvm/book3s_rtas.c
index 77f9aa5f4ba5..3219ba895246 100644
--- a/arch/powerpc/kvm/book3s_rtas.c
+++ b/arch/powerpc/kvm/book3s_rtas.c
@@ -63,6 +63,44 @@ static void kvm_rtas_get_xive(struct kvm_vcpu *vcpu, struct rtas_args *args)
 out:
 	args->rets[0] = rc;
 }
+
+static void kvm_rtas_int_off(struct kvm_vcpu *vcpu, struct rtas_args *args)
+{
+	u32 irq;
+	int rc;
+
+	if (args->nargs != 1 || args->nret != 1) {
+		rc = -3;
+		goto out;
+	}
+
+	irq = args->args[0];
+
+	rc = kvmppc_xics_int_off(vcpu->kvm, irq);
+	if (rc)
+		rc = -3;
+out:
+	args->rets[0] = rc;
+}
+
+static void kvm_rtas_int_on(struct kvm_vcpu *vcpu, struct rtas_args *args)
+{
+	u32 irq;
+	int rc;
+
+	if (args->nargs != 1 || args->nret != 1) {
+		rc = -3;
+		goto out;
+	}
+
+	irq = args->args[0];
+
+	rc = kvmppc_xics_int_on(vcpu->kvm, irq);
+	if (rc)
+		rc = -3;
+out:
+	args->rets[0] = rc;
+}
 #endif /* CONFIG_KVM_XICS */
 
 struct rtas_handler {
@@ -74,6 +112,8 @@ static struct rtas_handler rtas_handlers[] = {
 #ifdef CONFIG_KVM_XICS
 	{ .name = "ibm,set-xive", .handler = kvm_rtas_set_xive },
 	{ .name = "ibm,get-xive", .handler = kvm_rtas_get_xive },
+	{ .name = "ibm,int-off",  .handler = kvm_rtas_int_off },
+	{ .name = "ibm,int-on",   .handler = kvm_rtas_int_on },
 #endif
 };